Make it possible to search by Native Language and Language being learnt.
For instance, I am learning Japanese and speak English so I should search for Japanese speakers who are learning English. That way we can do an exchange and I think the community would build faster.
As another user stated, you can already do this on RhinoSpike. Visit https://rhinospike.com/profiles/search/ give a try!
Except it doesn't show you people who have live requests. All it does is show you hundreds of speakers of that language, some whom have made no requests or have have had them all completed, or some of whom haven't been on the site for years, so it's fairly useless. It needs to be organised to put people who have unsolved requests for help, people who help other users, or people who have logged into the site in the last century near the top.